/* ==========================================================================
   Layout - Header, Sidebar, Main Content Area
   ========================================================================== */

/* App shell */
.app-shell {
    display: flex;
    flex-direction: column;
    height: 100vh;
    overflow: hidden;
}

/* --------------------------------------------------------------------------
   Header Bar
   -------------------------------------------------------------------------- */

.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--header-bg);
    border-bottom: 2px solid var(--accent-primary);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 var(--space-lg);
    z-index: 1030;
    transition: background-color var(--transition-base), border-color var(--transition-base);
}

.header-brand {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    font-size: 1.25rem;
    font-weight: 700;
    color: var(--accent-primary);
    text-decoration: none;
}

.header-brand:hover {
    color: var(--accent-primary);
}

.header-brand img {
    height: 32px;
    width: auto;
}

.header-right {
    display: flex;
    align-items: center;
    gap: var(--space-md);
}

.header-user-btn {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    background: none;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    padding: var(--space-xs) var(--space-md);
    color: var(--text-primary);
    cursor: pointer;
    font-size: 0.875rem;
    transition: border-color var(--transition-fast), background-color var(--transition-fast);
}

.header-user-btn:hover {
    border-color: var(--accent-primary);
    background-color: var(--bg-tile-hover);
}

.header-user-btn .bi-person-circle {
    font-size: 1.25rem;
    color: var(--accent-primary);
}

.header-menu-toggle {
    display: none;
    background: none;
    border: none;
    color: var(--text-primary);
    font-size: 1.5rem;
    cursor: pointer;
    padding: var(--space-xs);
}

/* User dropdown menu */
.user-dropdown-menu {
    background-color: var(--bg-tile);
    border: 1px solid var(--border-color);
    box-shadow: var(--shadow-lg);
    border-radius: var(--radius-md);
    min-width: 220px;
}

.user-dropdown-menu .dropdown-item {
    color: var(--text-primary);
    padding: var(--space-sm) var(--space-md);
    font-size: 0.875rem;
}

.user-dropdown-menu .dropdown-item:hover {
    background-color: var(--bg-tile-hover);
    color: var(--accent-primary);
}

.user-dropdown-menu .dropdown-divider {
    border-color: var(--border-color);
}

.theme-option-label {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-xs) var(--space-md);
    font-size: 0.8125rem;
    color: var(--text-secondary);
    cursor: pointer;
}

.theme-option-label:hover {
    background-color: var(--bg-tile-hover);
}

.theme-swatch {
    display: inline-block;
    width: 14px;
    height: 14px;
    border-radius: 50%;
    border: 2px solid var(--border-color);
    flex-shrink: 0;
}

.theme-swatch.active {
    border-color: var(--accent-primary);
    box-shadow: 0 0 0 2px rgba(var(--accent-primary-rgb), 0.3);
}

/* --------------------------------------------------------------------------
   Sidebar Navigation
   -------------------------------------------------------------------------- */

.sidebar {
    position: fixed;
    top: var(--header-height);
    left: 0;
    bottom: 0;
    width: var(--sidebar-width);
    background-color: var(--sidebar-bg);
    border-right: 1px solid var(--border-color);
    overflow-y: auto;
    padding: var(--space-md) 0;
    z-index: 1020;
    transition: background-color var(--transition-base), border-color var(--transition-base), transform var(--transition-base);
}

.sidebar-nav {
    list-style: none;
    padding: 0;
    margin: 0;
}

.sidebar-nav-item {
    margin: 2px 0;
}

.sidebar-nav-link {
    display: flex;
    align-items: center;
    gap: var(--space-sm);
    padding: var(--space-sm) var(--space-lg);
    color: var(--sidebar-text);
    text-decoration: none;
    font-size: 0.9375rem;
    border-left: 3px solid transparent;
    transition: all var(--transition-fast);
}

.sidebar-nav-link:hover {
    background-color: var(--sidebar-active-bg);
    color: var(--accent-primary);
}

.sidebar-nav-link.active {
    background-color: var(--sidebar-active-bg);
    color: var(--accent-primary);
    border-left-color: var(--accent-primary);
    font-weight: 600;
}

.sidebar-nav-link i {
    font-size: 1.125rem;
    width: 24px;
    text-align: center;
    flex-shrink: 0;
    color: var(--text-muted);
    transition: color var(--transition-fast);
}

.sidebar-nav-link:hover i,
.sidebar-nav-link.active i {
    color: var(--accent-primary);
}

/* Sidebar sub-navigation */
.sidebar-subnav {
    list-style: none;
    padding: 0;
    margin: 0;
    display: none;
}

.sidebar-nav-parent.expanded .sidebar-subnav {
    display: block;
}

.sidebar-subnav .sidebar-nav-link {
    padding-left: calc(var(--space-lg) + 32px);
    font-size: 0.875rem;
}

.sidebar-nav-parent > .sidebar-nav-link::after {
    content: '\F282';
    font-family: 'bootstrap-icons';
    margin-left: auto;
    font-size: 0.75rem;
    transition: transform var(--transition-fast);
}

.sidebar-nav-parent.expanded > .sidebar-nav-link::after {
    transform: rotate(90deg);
}

/* --------------------------------------------------------------------------
   Main Content Area
   -------------------------------------------------------------------------- */

.main-content {
    margin-top: var(--header-height);
    margin-left: var(--sidebar-width);
    padding: var(--space-xl);
    overflow-y: auto;
    height: calc(100vh - var(--header-height));
    transition: margin-left var(--transition-base);
    background-color: var(--bg-secondary);
    background-image:
        radial-gradient(circle, rgba(var(--accent-primary-rgb), 0.08) 1px, transparent 1px),
        linear-gradient(rgba(var(--accent-primary-rgb), 0.03), rgba(var(--accent-primary-rgb), 0.03));
    background-size: 20px 20px, 100% 100%;
}

[data-mode="dark"] .main-content {
    background-image:
        radial-gradient(circle, rgba(var(--accent-primary-rgb), 0.12) 1px, transparent 1px),
        linear-gradient(rgba(var(--accent-primary-rgb), 0.05), rgba(var(--accent-primary-rgb), 0.05));
    background-size: 20px 20px, 100% 100%;
}

.page-header {
    display: flex;
    align-items: center;
    gap: var(--space-md);
    margin-bottom: var(--space-md);
}

.page-title-icon {
    color: var(--accent-primary);
    font-size: 2.5rem;
    line-height: 1;
    flex-shrink: 0;
}

.page-header-text {
    min-width: 0;
    margin-top: 15px;
}

.page-title {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--text-primary);
    margin: 0;
    padding-bottom: var(--space-xs);
    border-bottom: 2px solid var(--accent-primary);
    display: inline-block;
}

.page-subtitle {
    font-size: 0.875rem;
    color: var(--text-secondary);
    margin-top: var(--space-xs);
}

/* --------------------------------------------------------------------------
   Responsive
   -------------------------------------------------------------------------- */

@media (max-width: 991.98px) {
    .header-menu-toggle {
        display: block;
    }

    .sidebar {
        transform: translateX(-100%);
    }

    .sidebar.open {
        transform: translateX(0);
        box-shadow: var(--shadow-lg);
    }

    .main-content {
        margin-left: 0;
    }

    .sidebar-overlay {
        display: none;
        position: fixed;
        top: var(--header-height);
        left: 0;
        right: 0;
        bottom: 0;
        background-color: rgba(0, 0, 0, 0.4);
        z-index: 1019;
    }

    .sidebar-overlay.show {
        display: block;
    }
}